In some PBS markets like Baltimore/Washington, D.C. and Providence it's showing *tonight* at 8 (DC) or 10 (Prov). For most others the prime time showing is on Easter (April 16th), with repeats not in prime time on other dates. The filmmaker Peter Swanson has recut it for the one hour time slot.
And there's talk of a future stained-glass cruise in Europe by the sponsor of the show, AMA Waterways. I'll let you know how that develops.